Random pictures thread

We have these little cacti growing around our property. Flat little guys - don't know what they're called.

Yesterday, one started flowering with big beautiful yellow flowers but this morning they were gone. But then by midday, they were back! Here's 3:00pm today:
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And here's 8:30pm today - flowers closed back up for the night 5-1/2 hrs later!
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Amazing little plants!!