cycle, sickle

Cycle or cycle means a set of events or stages that recur or repeat, literally or figuratively--
He wrote a long poem about the cycle of the seasons.
He seemed trapped in a cycle of bad behavior and remorse.
Cycle is sometimes used to refer to one event in a series--
Add the fabric softener to the rinse cycle.

Cycle may also be a short form of bicycle or motorcycle--
He needs a new tire for his cycle.
Cycle may also mean to travel by bicycle--
We are going to cycle down to the lake tomorrow.
We could walk, but we'll get there faster if we cycle.

Sickle or sickle means a farm implement used to reap crops by hand, shaped like a letter "c" with a handle--
The hammer and sickle formed the emblem of the Soviet Union.
It once took days to reap crops with a sickle.

Now that you know that, you can say--
"We want to do a painting of the cycle of the seasons, and were thinking of a sickle to represent Summer."