Clearly distinguishable differences in the nature, coursing and quality of the stonework indicate that the structure was built and / or has been rebuilt or repaired in multiple phases over the course of its history.
At the foot of the wall (towards the left-hand side of the image), a stone interpretation panel can be seen. This panel features gold text on a red background, but the text is not legible in the image due to the angle of the panel and its distance from the camera.
About a quarter of the way up the tower's wall (about five courses above the top of the batter), a discontinuous band of red tiles can be seen. This visually-striking 'bonding course' was originally continuous and its absence in several places is the result of repairs carried out at some point in history. The rough nature of these repairs indicates that they were carried-out for structural / defensive purposes, with absolutely no regard for aesthetics.
A row of four arrow slits can be seen in the upper portion of the tower. Each arrow slit is positioned in the horizontal centre of a facet (i.e. a flat section of the tower's multi-faceted wall). Above the left-most arrow slit (which is above the stone interpretation panel), a projecting stone water spout can be seen. This feature suggests that the tower was probably roofed at some point in its history.
The extreme left-hand side of the image is filled with some of the shrubs and trees that make York's Museum Gardens such a pleasant and attractive recreational space.
Part of the York Library building can be seen in the top-right hand corner of the image.
An area of short grass runs across the image's bottom edge.
The relatively low angle of the sun has given the entire scene a warm, but slightly surreal glow. However, this contrasts markedly with the menacing black clouds that can be seen above the tower at the top of the image. As a consequence, the image has a distinctly 'moody' feel. A viewer with an active imagination might feel that the image depicts the calm before the storm: perhaps even a brief period of peace, before the onslaught of an attacking army . . . !