A great way to keep cool is to sit close to an electric fan....
The fan is 38cm on each of its SQUARE sides. The fans grill
is 32cm dia (CIRCULAR) and the fisheye lens was 15cm from the centre of
the fan. Uncorrected wideangles (aka Fisheyes)will keep circles,
circular when taken directly over their centre point, but straight
lines become curved to fit the perspective of the enormas wideangle.
The Samyang closest focus is 30cm on its focus scale but stopped
down it achieves a little more at 15cm closest focus distance.